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Finding the Fourth Proportional to 156.90, 234.81 and 121.02

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Solution

The fourth proportional to 156.90, 234.81 and 121.02 is: 181.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.90 : 234.81 = 121.02 : x
  2. Step 2: Convert to fraction form
    156.90/234.81 = 121.02/x
  3. Step 3: Cross multiply
    156.90x = 234.81 × 121.02
  4. Step 4: Simplify right side
    156.90x = 28,416.71
  5. Step 5: Solve for x
    x = 28,416.71/156.90
  6. Step 6: Final answer
    x = 181.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.